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-- CXAC004.A

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--*

--

-- OBJECTIVE:

--      Check that the Stream_Access type and Stream function found in package

--      Ada.Text_IO.Text_Streams allows a text file to be processed with the

--      functionality of streams.

--

-- TEST DESCRIPTION:

--      This test verifies that the package Ada.Text_IO.Text_Streams is

--      available and that the functionality it contains allows a text file to

--      be manipulated as a stream.

--      The test defines data objects of a variety of types that can be stored

--      in a text file.  A text file and associated text stream are then

--      defined, and the 'Write attribute is used to enter the individual data

--      items into the text stream.  Once all the individual data items have

--      been written to the stream, the 'Output attribute is used to write

--      arrays of these same data objects to the stream.

--      The text file is reset to serve as an input file, and the 'Read

--      attribute is used to extract the individual data items from the

--      stream.  These items are then verified against the data originally

--      written to the stream. Finally, the 'Input attribute is used to

--      extract the data arrays from the stream. These arrays are then

--      verified against the original data written to the stream.

--

-- APPLICABILITY CRITERIA:

--      Applicable to implementations that support external text files.

--

-- CHANGE HISTORY:

--      06 Jul 95   SAIC    Initial prerelease version.

--      26 Feb 97   PWB.CTA Allowed for non-support of some IO operations;

--                          removed requirement for support of decimal types.

--!

with Report;

with Ada.Text_IO;

with Ada.Text_IO.Text_Streams;

with Ada.Characters.Latin_1;

with Ada.Strings.Unbounded;

procedure CXAC004 is

   Data_File     : Ada.Text_IO.File_Type;

   Data_Filename : constant String :=

                           Report.Legal_File_Name ( Nam => "CXAC004" );

   Incomplete : exception;

begin

   Report.Test ("CXAC004", "Check that the Stream_Access type and Stream "   &

                           "function found in package "                      &

                           "Ada.Text_IO.Text_Streams allows a text file to " &

                           "be processed with the functionality of streams");

   Test_for_IO_Support:

   begin

      -- Check for Text_IO support in creating the data file.  If the

      -- implementation does not support external files, Name_Error or

      -- Use_Error will be raised at the point of the following call to

      -- Create, resulting in a Not_Applicable test result.

      Ada.Text_IO.Create(Data_File, Ada.Text_IO.Out_File, Data_Filename);

   exception

       when Ada.Text_IO.Use_Error | Ada.Text_IO.Name_Error =>

          Report.Not_Applicable

             ( "Files not supported - Create as Out_File for Text_IO" );

          raise Incomplete;

   end Test_for_IO_Support;

   Test_Block:

   declare

      use Ada.Characters.Latin_1, Ada.Strings.Unbounded;

      TC_Items  : constant := 3;

      -- Declare types and objects that will be used as data values to be

      -- written to and read from the text file/stream.

      type Enum_Type          is (Red, Yellow, Green, Blue, Indigo);

      type Fixed_Type         is delta 0.125 range 0.0..255.0;

      type Float_Type         is digits 7 range 0.0..1.0E5;

      type Modular_Type       is mod 256;

      subtype Str_Type        is String(1..4);

      type Char_Array_Type    is array (1..TC_Items) of Character;

      type Enum_Array_Type    is array (1..TC_Items) of Enum_Type;

      type Fixed_Array_Type   is array (1..TC_Items) of Fixed_Type;

      type Float_Array_Type   is array (1..TC_Items) of Float_Type;

      type Int_Array_Type     is array (1..TC_Items) of Integer;

      type Mod_Array_Type     is array (1..TC_Items) of Modular_Type;

      type Str_Array_Type     is array (1..TC_Items) of Str_Type;

      type Unb_Str_Array_Type is array (1..TC_Items) of Unbounded_String;

      Char_Array      : Char_Array_Type    := ('A', 'z', Yen_Sign);

      TC_Char_Array_1,

      TC_Char_Array_2 : Char_Array_Type    := (others => Space);

      Enum_Array      : Enum_Array_Type    := (Blue, Yellow, Indigo);

      TC_Enum_Array_1,

      TC_Enum_Array_2 : Enum_Array_Type    := (others => Red);

      Fix_Array       : Fixed_Array_Type   := (0.125, 123.5, 250.750);

      TC_Fix_Array_1,

      TC_Fix_Array_2  : Fixed_Array_Type   := (others => 0.0);

      Flt_Array       : Float_Array_Type   := (1.0, 150.0, 1500.0);

      TC_Flt_Array_1,

      TC_Flt_Array_2  : Float_Array_Type   := (others => 0.0);

      Int_Array       : Int_Array_Type     := (124, 2349, -24_001);

      TC_Int_Array_1,

      TC_Int_Array_2  : Int_Array_Type     := (others => -99);

      Mod_Array       : Mod_Array_Type     := (10, 127, 255);

      TC_Mod_Array_1,

      TC_Mod_Array_2  : Mod_Array_Type     := (others => 0);

      Str_Array       : Str_Array_Type     := ("abcd", "klmn", "wxyz");

      TC_Str_Array_1,

      TC_Str_Array_2  : Str_Array_Type     := (others => "    ");

      UStr_Array      : Unb_Str_Array_Type :=

                                        (To_Unbounded_String("cat"),

                                         To_Unbounded_String("testing"),

                                         To_Unbounded_String("ACVC"));

      TC_UStr_Array_1,

      TC_UStr_Array_2 : Unb_Str_Array_Type :=

                                        (others => Null_Unbounded_String);

      -- Create a stream access object pointing to the data file.

      Data_Stream : Ada.Text_IO.Text_Streams.Stream_Access :=

                      Ada.Text_IO.Text_Streams.Stream(File => Data_File);

   begin

      -- Use the 'Write attribute to enter the three sets of data items

      -- into the data stream.

      -- Note that the data will be mixed within the text file.

      for i in 1..TC_Items loop

         Character'Write       (Data_Stream, Char_Array(i));

         Enum_Type'Write       (Data_Stream, Enum_Array(i));

         Fixed_Type'Write      (Data_Stream, Fix_Array(i));

         Float_Type'Write      (Data_Stream, Flt_Array(i));

         Integer'Write         (Data_Stream, Int_Array(i));

         Modular_Type'Write    (Data_Stream, Mod_Array(i));

         Str_Type'Write        (Data_Stream, Str_Array(i));

         Unbounded_String'Write(Data_Stream, UStr_Array(i));

      end loop;

      -- Use the 'Output attribute to enter the entire arrays of each

      -- type of data items into the data stream.

      -- Note that the array bounds will be written to the stream as part

      -- of the action of the 'Output attribute.

      Char_Array_Type'Output    (Data_Stream, Char_Array);

      Enum_Array_Type'Output    (Data_Stream, Enum_Array);

      Fixed_Array_Type'Output   (Data_Stream, Fix_Array);

      Float_Array_Type'Output   (Data_Stream, Flt_Array);

      Int_Array_Type'Output     (Data_Stream, Int_Array);

      Mod_Array_Type'Output     (Data_Stream, Mod_Array);

      Str_Array_Type'Output     (Data_Stream, Str_Array);

      Unb_Str_Array_Type'Output (Data_Stream, UStr_Array);

      -- Reset the data file to mode In_File.  The data file will now serve

      -- as the source of data which will be compared to the original data

      -- written to the file above.

      Reset1:

      begin

         Ada.Text_IO.Reset (File => Data_File, Mode => Ada.Text_IO.In_File);

      exception

         when Ada.Text_IO.Use_Error =>

            Report.Not_Applicable

               ( "Reset to In_File not supported for Text_IO" );

            raise Incomplete;

      end Reset1;

      -- Extract and validate all the single data items from the stream.

      for i in 1..TC_Items loop

         Character'Read        (Data_Stream, TC_Char_Array_1(i));

         Enum_Type'Read        (Data_Stream, TC_Enum_Array_1(i));

         Fixed_Type'Read       (Data_Stream, TC_Fix_Array_1(i));

         Float_Type'Read       (Data_Stream, TC_Flt_Array_1(i));

         Integer'Read          (Data_Stream, TC_Int_Array_1(i));

         Modular_Type'Read     (Data_Stream, TC_Mod_Array_1(i));

         Str_Type'Read         (Data_Stream, TC_Str_Array_1(i));

         Unbounded_String'Read (Data_Stream, TC_UStr_Array_1(i));

      end loop;

      if TC_Char_Array_1 /= Char_Array then

         Report.Failed("Character values do not match");

      end if;

      if TC_Enum_Array_1 /= Enum_Array then

         Report.Failed("Enumeration values do not match");

      end if;

      if TC_Fix_Array_1 /= Fix_Array then

         Report.Failed("Fixed point values do not match");

      end if;

      if TC_Flt_Array_1 /= Flt_Array then

         Report.Failed("Floating point values do not match");

      end if;

      if TC_Int_Array_1 /= Int_Array then

         Report.Failed("Integer values do not match");

      end if;

      if TC_Mod_Array_1 /= Mod_Array then

         Report.Failed("Modular values do not match");

      end if;

      if TC_Str_Array_1 /= Str_Array then

         Report.Failed("String values do not match");

      end if;

      if TC_UStr_Array_1 /= UStr_Array then

         Report.Failed("Unbounded_String values do not match");

      end if;

      -- Extract and validate all data arrays from the data stream.

      -- Note that the 'Input attribute denotes a function, whereas the

      -- other stream oriented attributes in this test denote procedures.

      TC_Char_Array_2 := Char_Array_Type'Input(Data_Stream);

      TC_Enum_Array_2 := Enum_Array_Type'Input(Data_Stream);

      TC_Fix_Array_2  := Fixed_Array_Type'Input(Data_Stream);

      TC_Flt_Array_2  := Float_Array_Type'Input(Data_Stream);

      TC_Int_Array_2  := Int_Array_Type'Input(Data_Stream);

      TC_Mod_Array_2  := Mod_Array_Type'Input(Data_Stream);

      TC_Str_Array_2  := Str_Array_Type'Input(Data_Stream);

      TC_UStr_Array_2 := Unb_Str_Array_Type'Input(Data_Stream);

      if TC_Char_Array_2 /= Char_Array then

         Report.Failed("Character array values do not match");

      end if;

      if TC_Enum_Array_2 /= Enum_Array then

         Report.Failed("Enumeration array values do not match");

      end if;

      if TC_Fix_Array_2 /= Fix_Array then

         Report.Failed("Fixed point array values do not match");

      end if;

      if TC_Flt_Array_2 /= Flt_Array then

         Report.Failed("Floating point array values do not match");

      end if;

      if TC_Int_Array_2 /= Int_Array then

         Report.Failed("Integer array values do not match");

      end if;

      if TC_Mod_Array_2 /= Mod_Array then

         Report.Failed("Modular array values do not match");

      end if;

      if TC_Str_Array_2 /= Str_Array then

         Report.Failed("String array values do not match");

      end if;

      if TC_UStr_Array_2 /= UStr_Array then

         Report.Failed("Unbounded_String array values do not match");

      end if;

   exception

      when Incomplete =>

         raise;

      when others => Report.Failed ("Exception raised in Test_Block");

   end Test_Block;

   Deletion:

   begin

      -- Delete the data file.

      if not Ada.Text_IO.Is_Open(Data_File) then

         Ada.Text_IO.Open(Data_File, Ada.Text_IO.In_File, Data_Filename);

      end if;

      Ada.Text_IO.Delete(Data_File);

   exception

      when others =>

         Report.Failed

            ( "Delete not properly implemented for Text_IO" );

   end Deletion;

   Report.Result;

exception

   when Incomplete =>

      Report.Result;

   when others     =>

      Report.Failed ( "Unexpected exception" );

      Report.Result;

end CXAC004;